|
Hi all,
I have already know that luminous would use more
memory for bluestore cache than the config setting, but I was expecting 1.5x not
7-8x.
below is my bluestore
cache setting
[osd]
osd
max backfills = 4
bluestore_cache_size
= 134217728
bluestore_cache_kv_max
= 134217728
osd
client message size cap = 67108864
My osd nodes have only 2G memory and I ran 2
osds per node.So I set the cache value very low.
I was running a read throughput test and
then found some of my osds were killed by oom killer and restarted.I found the
oom killed osd used much more memory for bluestore_cache_data than the normal
ones.
The oom killed osd used 795MB ram in mempool
and 722MB in bluestore_cache_data
The normal osd used about 120MB ram in mempool and
17MB in bluestore_cache_data
graph of memory useage of the oom killed osd: https://pasteboard.co/H1GzihS.png
graph of memory useage of the nomral osd: https://pasteboard.co/H1GzaeF.png
Is this a bug of bluestore cache or I misunderstood the
meaning of bluestore cache setting in config?
2018-01-06
lin.yunfan |
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